srand

[t420h]

does anyon know how to use the srand function? i have to generate a rndom number for a math prblem btwn 1..10 but i want them to be different everytime. i understand srand does this but i cat get it to work.


heres what i have

cout<<"generating random numbers between 1 and 10.....\n";


temp1 = tempA+double(rand())*((tempB-tempA)/RAND_MAX);
temp2 = tempA+double(rand())*((tempB-tempA)/RAND_MAX);

cout<<"\nThe first number is "<<temp1;
cout<<"\nThe second number is "<<temp2<<"\n";
cout<<"\nCan you figure out "<<temp1<<oper<<temp2<<" ?\n";
cin>>UserAns;
system("CLS");
return 0;

[jim mcnamara]

[code]

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int main(void){
int i, stime;
long ltime;
ltime = time(NULL);
stime = (unsigned) ltime/2;
srand(stime);
for (i=0;i<10;i++) printf("%d ",(int))10* (float)(rand()/RAND_MAX)));

printf("\n");
return 0;
}

[CornedBee]

stime;
long ltime;
ltime = time(NULL);
stime = (unsigned) ltime/2;
srand(stime);


Why?
Why not simply
srand(time(NULL));
?

[jim mcnamara]

long and int are not the same for the compiler that was written for. Avoids overflow.

In VC++ you would not need to do that.